Juan angles t gibbet



JUAN ANGLES Y GIBER T SCREW PRUPEJLLER. No. 424,056. Patented M-a1i.25,

' of the two blades.

UNITED STATES PATENT OFFICE.

UAN ANGLES Y GIBERT, or NEW YORK, N. Y.

S C R EW R O P E L L E R SPECIJEIGA'1ION forming part of Letters Patent No. 424,056, dated March 25, 1890.

Application filed July 23, 1889- Serial1lo. 318,444- (No model.)

To all whom it may concern.-

Be it known that I, JUAN Anomts Y GIBER'1, residing in the city of New York, county and State of New York, have invented a new and useful Screw or Propeller Applicable to the Navigation of Boats, of which the following is a specification.

Figure 1 represents the propeller, viewed endwise of the shaft upon which it is fixed. Fig. 2 represents the same, viewed at right angles with the axis of the shaft from a point in the line of intersection between the planes Fig. 3 represents the same, viewed from a position in the plane of one of the blades diagonal to the axis of the shaftviz., from the direction of the arrow, Fig. 2. Fig. 4 represents the same, viewed at right anglee to the shaft and in a line at right angles to the line of intersection between the planes of the two blades. Fig. 5 is a modification in which the two blades instead of being arranged opposite to each other are arranged at diiferent points lengthwise of the shaft.

a is a hub keyed fast to the shaft 19.

c and d are the blades. These blades are preferably each of the form represented in flat and edge view in Fig. 3, each consisting of a semi-elliptical disk. These disks are placed in planes which cross each other at right angles, and which are each inclined at an angle of about forty-five degrees to the axis of the shaft. The result of this form and location is that when the shaft is revolved upon its axis the space included within the sweep of the blades is substantially cylindrical. This concentrates and equalizes the forces equidistant from the axis of rotation, and for a minimum of radius and of surface brings a maximum of space within the sweep of the blades, and therefore produces a maximum of water displacement under their action. With this new screw as a type modifications may be deduced in accordance with substantially the same system. Thus a screw with a single half-disk formed and arranged relatively to the shaft like either of the disks above described revolves also in a spherical volume. Again, half-disks may be placed one alongside of another on a single axis, each of which revolves in a spherical volume, as shown in Fig.

A propeller, as above described, four meters in diameter includes within its sweep thirtythree cubic meters, whereas the best form of propeller known to me heretofore, six meters in diameter, fell short of the volume thirtythree cubic meters, and on account of its greater diameter could not revolve with the same velocity as mine under the same propelling-power.

I am aware that it has been proposed to construct propellers from fiat blades formed in half or a less portion of a circle combined with each other at an angle of less then fortyfive degrees; but in no case to my knowledge has it ever been proposed to construct a propeller which would include within the sweep of its blades a cylinder the length of which was substantially equivalent to its diameter,

which is accomplished, as I believe, for the first time by myself in arranging my two semielliptical blades substantially at right angles with one another, and so that the plane of each of them forms an angle of forty-five degrees with the axis of rotation. By this construction, also, the blades actually traverse one-half of the space within the cylinder of JUAN ANGLES Y GIBERT. Witnesses:

S. O. EDMONI)S, J. GEEER. 

